Operation Manual

Chapter 8: Draw Instructions 128
To cancel Horizontal or Vertical, press ‘.
Drawing a Line from the Home Screen or a Program
Horizontal (horizontal line) draws a horizontal line at Y=y. y, which can be an expression but not a list.
Horizontal y [,color#, line style#]
Vertical
(vertical line) draws a vertical line at X=x. x, which can be an expression but not a list.
Vertical x [,color#, line style#]
To instruct the TI-84 Plus C to draw more than one horizontal or vertical line, separate each instruction
with a colon ( : ).
Drawing Tangent Lines
Drawing a Tangent Line Directly on a Graph
To draw a tangent line when a graph is displayed, follow these steps.
1. Select
5:Tangent( from the DRAW menu.
2. Press t b to change the color and line style using spinner menus.
3. Press † and } to move the cursor to the function for which you want to draw the tangent line.
The current graph’s Y=
function is displayed in the top-left corner, if ExprOn is selected.
4. Press ~ and | or enter a number to select the point on the function at which you want to draw the
tangent line.
MathPrint™ Classic